Yeah. Some enemy variety may spice things up. Not sure if it's easier to program in something that's more aggressive in engaging the player (enemy "aces") or larger, more capable enemy ship classes (frigates, etc). You could also increase the value of torpedoes by making a class of enemy shielded from regular guns. Bit cheap, but should be easier to program in.
Just thoughts. I've found this game fascinating, honestly, because it really highlights how orbital space combat would actually look compared to preconceptions one might have from the likes of Star Trek, Star Wars, NBSG, Battlefleet Gothic, Homeworld, etc. Well beyond the scale of this project, but I'd love to see an RTS game with orbital mechanics one day.